This is a movie about Tokyo Island, Kozushima -which means the place gods gather. With getting on the ship of Tokaikisen ( you can go to Kozushima in about 8 hours. At night from Tokyo bay the ship leaves toward islands, and in morning you will see them.
In Kozushima, there are 3 main campsites; Sawajiri campsite, Nagahama campsite and Takowan campsite. All of them are set for family campsite, so at night it'd be better to be peacefully. (campsite info→
You can borrow bicycle, skateboard, motorcycle or car. The land is so rough, you have to go up and down, so those items are necessary for moving around. You also can catch a cab but the number of it is low.
Takowan, I mentioned Happy bay in the film, is so nice place for fishing. But please watch out coz waves are so strong and suddenly it's so deep. For more info, you can ask me about visiting this island.